This invention relates to liquid dispensing pumps, and'more'particularly to those used in soda fountain equipment for dispensing sirups, beverages, and the like.v

Heretofore, it has been possible with pumps of this type to dispense a more or less than predetermined measured charge of liquid by manipulation of the ,operating handle. In other words, it was possible for the operator to move thev plunger av fraction yof a full strokey and thus cheat the customer by giving less than a 'predetermined charge or to cheat lthe owner by giving more than the predetermined charge Vof liquid.

The present invention contemplates a dispensing pump in which such practice on the part of the fountain operator will be Obviated, and one of the objects thereof is the pro vision of a liquid dispensing pump in which only a predetermined charge of liquid can be dispensed ina single operation of the same.

Another object is to provide a liquid dispensing pump of the plunger type wherein only a full stroke of the plunger can be ob,- tained when operated in either direction.

Another object is to provide a liquid dispensing pump of the plunger type with controlling means for the plunger for restraining the same against reversional movement in incomplete states of the operation.

A further object is to provide a liquid dispensing pump ofthe plunger type with means acting on the plunger rod which, when the plunger is being actuated in one direction, automatically locks the plunger against a return movement in the opposite direction until a full stroke is accomplished.

With the above andother objects in view, which will be apparent from the detailed description which follows, the invention consists in certain novel features of construction and combinations of parts which will be readily understood by those skilled in the art to which the invention appertains.

In the drawings which illustrate one em bod iment of the invention, A

Figure 1 is a vertical sectional view through a liquid dispensing pump showing the same in normal inoperative position in a sirup ar.

PUMP

1930. Serial No. 458,376.

Fig. 2 is an enlarged sectional View of the lower part of the pump illustrated in Fig. l, showing the plunger part-way down and the locking mechanism in position to prevent a return movement of the plunger;

Fig. 3 is a transverse section taken substantially on the line 3 3 of Fig. 2, showing the plunger rod locking means; V

Fig. 4 is a transverse section taken substantially on the line 4 4 of Fig. 2; 1

Fig. 5 is a section similar to Fig. 2 showing the plunger at the bottom of itsstroke and the locking mechanism reversed to permit return; i

Fiof. 6 is a transverse section taken substantia-lly on the line 6,-6 of Fig. 5;

Fig. 7 is a side elevation of the collar for supporting the locking means, a portion being broken away to show the same in longitudinal section;

Fig. 8 is a side elevation of the tapered locking sleeve, a portion being broken away to show the same in longitudinal section; and

Fig. 9 is an axial section of a modified form Ofdadjusting collarmounted on the plimger ro Referring to the accompanying drawings in which like numerals refer to like parts throughout the several views, the liquid dis'- pensing pump of the present invention is shown, for the purpose of illustration, mounted within a suitable sirup jar or container 1 containing the liquid to be dispensed, and is supportec there by means of a peripherally fianged cover-plate 2 arranged to seat on an upstanding flange 3 surrounding the opening of the jar 1. V

The pump shown in the drawings is of the type comprising a plunger 4 reciprocable within a cylinder 5 to discharge liquid on its up stroke. The cylinder 5 may be formed of a section of suitable tubing and is mounted on a head 6 which is supported from a reinforcing plate 7 secured to the cover-plate 2. The reinforcing plate 7 has a depending rod member 8 rigidly secured thereto which is suitably secured at its lower end to the head 6 to support one side of the head 6. The other side of the cylinder head 6 is supported from the cover-plate 2 by means of the displunger 4 is axia yit is threaded into the base 13 of the delivery spout 14, the spout 14 being provided with a discharge passage 15 incommunicat-ion with the conduit 9. f i

The base 13 for the ,discharge spout 14Kis mounted on the upper side of the cover-plate .2 by means of a cylindrical guide sleeve 16 which extends through the base and lcoverplatein axial alignment Vwith the cylinder 5 and is provided with a ,nut 17 threaded thereonto at its end projecting beyond the rei/n-v foacing plate7whi'ch securely clamps the base 13 between thel shoulder 18 formed at the upper endoiy the sleeve and the coverj plate-2. i v f The plunger 4 is actuated in the cylinder 5 by@ plunger -rod 19Y having a reduced end portion whiehextends axially throug-h the plu 4,.. A shouldered collar 2() is interpose between theplunger 4 and the` shoulder formed on the plunger rod .19 and ya nut 21 is threaded on the reduced end of the rod 19 to hold the plunger 4 against the collar 20. The plunger 4 'is formed with a number of openings 22'to admit liquid to the upper'side ofthe-cylinderon the ldown stroke of the plunger, and `these openings are covered 'by ,a floating disk valve 23 surrounding the collar andndapted toseat against the upper rside oftheplunger yon the upward stroke, whereby the same discharges the liquid through the pnssagegl() into the discharge conduit 9. The' end of the langer rod 19 adj aoent the lly guided by a shouldered mit 24th-leaded into the cylinder head 6. The phmger rod extends upwardly through bottomof the sleeve member 16 and is thereby,- and is provided with an operating handle 25 atits upperend. The operting handle 25' is provided vwith a cylinder portion y 26 which vis 'telescoped with and adaptedte slide :axiallyin the sleeve 16, a coiled spring 27 surrounding 19 and engaging the bottom of the sleeve 16, the handle 24 being provided to riliently hold the plunger in normal inoperative position at the top of the cylinder -5. `In operation,y the handle 2K5 is depressed Against the "pressure of the coil spring 27 thereby movingthe ,plu-nger '4 toward the bottom of the cylinder 5 and permitting liquid torase the vrdisk .valve 23 and pass through the opening 22 in the plunger 4 to the upper end'o: the. cylinder. The handle 25 is then released ,and the spring 27 ycauses the -plunger toi'eturn, thus seating the disk valve 23 over theo enings and moving Ythe liquid' in the @Y above the plunger through the passage 10, past the check valve 28 and into the dischar e conduit 9 and dischar e spout 14, the checr valve 28 being provide to prevent the return of liquid from the discharge conduit 9 to the cylinder 5.

The ,pump construction so far vdeacribed may be said to beconventional,y and it can be seen that the least downward movement will permit liquid to be discharged on the return movement; g f

The'present invention, as previously stated, contemplates means to automatically prevent a" reverse movement of the plungerV until it has made., a complete predetermined stroke in one direction, in norder that a measured charge kof liquid of predetermined amwnt will be'discharged or dispensed. at each operation 4of the pump. This meansfor prevent ing reverse movementof the plunger 4 will now be described.

The plunger rod19 is arranged to axially slide kin a sleeve 29 Yonly having 'bearing engagement with the Vrod over a relatively vsmall central area, as shown in Figs. .'5 and 7. This sleeve 29 is formed intermediate its ends wi-th i argnumber o :lvcireu'rnferentially arranged openingsO, each of which carries a hardened steel ball 31 and the sleeve is slidably mounted in a pair of superposed locking collars 32 contained within a cylindrical member 33 that is secured at one end to the threaded head nut 24. An annular externally threaded nut 34 surrounding the plunger rod is threaded linto, the upper'end of theunember 33 and prevents axial movement of the vcollars 32. These locking collars'y abut against each other adjacent the balls31 and the inner cylindrical surface of `each is tapered at 35 toward lthe other to provide a housing for the'balls 31 which, asfshown in F 1g'. shtly greater diameter than the thickest'w f portion of the sleeve 29.n These tapered `surfaces I35 are provided as will kbe laterapparent,l -to wedge the balls y31 Vagainst the plunger.. rod 19 tov prevent movement thereof in a certain direction. i

Each locking collar V32 at the end opposite the tapered surface 35 is formed with Icircu-mferentially arranged openings 36 which open into circumferential grooves' 37 yand which carry suitable ball detents 38. A flat spring member 39 'is'positioned within the alignedlongitudinalgrooves 37 of the collars 32 and' its ends are arranged to resiliently bear against the ball detente 38 in the respective openings 36 of the collars 32, the spring member 39 having a projection 40 which extends into" an openin 41 inthe surrounding casing 33. -mova le sleeve 29 is provided on its outer vsurface and at each end with a circumferential depression Y42 having diver# gent side walls. lThe mean distance between these depressions 42 is slightly greater` than themean distance between theftwo series of ball detents 38 carried by the locking collars es z " jacent ends i against the lower annular end of with vwhich the balls 31 32, so thaty when the sleeve 29 is in one position the one series of detents 38 will be held in one ot the depressions 42, and when the sleeve 29 is in another position the other series of detents will be held in the other depression 42. j

The nut 24 threaded into the head 6 and which surrounds the plunger rod 19 is provided with a number' of pins 43 which slidably extend therethrough and which are adapted under certain conditions to be engaged and actuated by the shoulder 44 Jformed on the plunger spacer collar 20 to move the locking sleeve 29 relative to the collars 32.

The plunger rod 19 is threaded at 47 intermediate its ends above the locking device just described and has an annular member 45 which is provided with a threaded plug 46 that engages the threads 47. A screw 43 is threaded into the member 45 to force the plug 46 into locked engagement with the threads 47 on the plunger rod 19. By loosening the screw 43 the member 45 can be moved fl to the desired adj usted position on the plunger rod 19 in order to regulate the stroke ot the plunger 4. This member 45 has a portion 49 of reduced diameter which is engageable with the sleeve 29 when the plunger is actul ated downwardly.

A modiied adjustable member 53 corresponding to the member 45 is shown in Fig. 9. In this construction the plunger rod is formed in two parts 51 and 52 and the adare threaded in the same direction, the member 53 being threaded onto these parts 51 and 52, and provided with a suitable lock nut 54. To adjust the position ot the member 53, the locking nut 54 is loosened and the member 53 is threaded in the desired directions. Relative rotation ot the rod parts 51 and 52 'is prevented by providing a tongue and groove 55 in engage-ment therebetween.

The normal inoperative position ol the dispensing pump of the present invention is shown in Fig. 1.V 1n this position it will be noted that the plunger 4 is at the top of the cylinder and that the shoulder 44 ot the spacer engages the pins 43 which abut the locking sleeve 29. 1t will also be noted that the sleeve is in an uppermost position with the lower ball detente 33 positioned in the lower depression 42 by the spring 39, and with the upper detents 33 engaging the outer surface of the sleeve 29. Furthermore the balls 3l are held in a contacting position with both the plunger rod 19 and the tapered surface 35 of the uppermost locking collar 32 by the sleeve 29.

When it is desired to dispense liquid Jfrom the 1 the plunger operating handle 25 is depressed to move the plunger rod 19 downwardly. The walls ot the inclined surface are 1n engagement being divergent from the downward direction of movement of the plunger rod 19, do not exert any wedging action and thus permit the downward movement ot the plunger rod 19. Assuming that the operator only wishes to dispense an amount ot liquid less than the predetermined quantity, such as the amount represented by the position ot the plunger when it has moved downwardly to the position indicated in Fig. 2. he releases the handle 25. and because of the tact that the side walls of the collar 32 with which the balls 31 Contact converge toward the return movement of the plunger rod 19 and because of the rictional engagement of the balls 31 with both the surface 35 and the rod 19, any tendency of the rod 19 toward a return movement wedges the balls 31 into tighter engagement with the surface 35 and the rod 19, thus locking the rod 19 against return movement.

hat is, it is locked against return movement when the plunger 4 has only been moved downwardly on the cylinder loading stroke to the position shown in Fig. 2.

ln order to return the plunger to its original pos vion it is then necessary to move the plunger' 4 to the full end of its downward stroke and lill the cylinder with the predetermined charge of liquid. As the plunger reaches the end ot its downward stroke the portion 49 ot the member 45 engages the upper annular end of the sleeve 29 and moves the sleeve downwardly until the ball detents 38 carried by the upper collar 32 align with the upper depression 42 of the sleeve 29, thus shifting the balls 31 into engagement with the tapered surface 35 orn the lower locking collar 32. This position is shown in Fig. 5 and it is thus obvious that because of the tact ythat the lower tapered surtace 35 diverges upwardly, the plunger 4 when the pressure is released therefrom will be returned to its uppermost position and will'discharge the measured quantity of liquid contained within the cylinder 5. For the reasons previously mentioned, it is further obvious that the operator cannot stop the upward progress of the plunger etere it makes a full stroke, in order to move the plunger downwardly and discharge an added amount of liquid. lV ith the locking sleeve 29 in the position shown in Fig. 5, any downward movement of the plunger rod 19 wedges the balls 31 against the lower tapered surface 35 and the plunger rod 19.

As the plunger 4 nears the top of its upward stroke, the flange 44 ot the spacer 2O engages the pins and moves the sleeve 29 to the original position shown in 1.

lt is obvious that by adjusting the operating member on the plunger rod 19 to the desired position, that any desired charge of liquid can be admitted. since the member 45 determines the position at which the plunger can no longer be moved downwardly.

It is clearly apparent that the present invention provides simple and eilicient means for a liquid dispensing pump which permits only a predetermined kcharge of liquid to be dispensed during a single operation ofthe plunger and furthermore that with the device of the present invention, the dispensing plunger can be returned to its original position only after a full stroke thereof in the one direction. f

The advantages of the above feature are readily apparent for the reason that the nonreversible means described prevents the operator of the dispensing pump from discharging more or less than the charge desired by the owner.

Aside from the specific embodiments of the invention herein shown and described, it will be understood that numerous details of the construction may be altered or omitted without'departing from the spirit and scope of this invention. v

1. In a liquid dispensing pump, a reciprocablefplunger, an operating rod therefor, a handlesecured to said rod for imparting a down stroke to said rod and plunger, spring means for imparting an up stroke to said rod and plunger, and means directly engageable with said rod'permitting a full down stroke only and a full up stroke only of said rod and plunger, said means comprising an axially movable sleeve surrounding said rod, a sta-k tionary shell surrounding said sleeve, a plu-k rality of ball members carried by said sleeve engageable with said rod, and means on said shell for wedging said ball members against said rod during reverse movement of said rod after Ipartial strokes in one direction.

n a liquid dispensing pump, a recipro-` cable plunger, an operating rod therefor, a handle secured to said rod for imparting a down stroke to said rod and plunger, spring means for imparting an up stroke to said "g rod 'and plunger, and means directly engageable with said rod permitting a full down stroke only and a full up stroke only of said rod and plunger, said means comprising an axially movable sleeve surrounding said rod,

, a cylindricalhousing around said sleeve hav-r` ing tapered circumferential surfaces converging away from said rod, ball members carried by saidsleeve and being movable perpendicular thereto in engagement with saidkr rod and one of said tapered surfaces, and means for shifting said sleeve to rmove said balls into engagement with said rod and the other of said ytapered surfaces.

y 3. In a liquid dispensing pump, a reciprocable plunger,fan operating rod therefor, a handle secured to said rod for imparting a down stroke to said rod and plunger, sprl-ng means for imparting an up stroke to said rod and plunger, and means directly engageable with said rod permitting ay full down strokeonly andy a full up stroke only of said rod and plunger, saidmeans comprising an axially movable sleeve surroundin said rod, a cylindrical yhousing around sai sleeve having tapered surfaces converging away from said sleeve, ball members carried by said vsleeve'a'nd being movable transversely therewith in engagement with said rod and one of said tapered surfaces, and spaced means on said rod at opposite sides of'said sleeve arran ed at the end of a full stroke thereof to shit said sleeve and move said ball members into engagement with said rod and the other of said tapered surfaces.- K

4. In a liquid dispensing pump, a plunger an operating rod for reciprocating sai plunger, and means directly engageable with said rod to prevent reverse movement of said rod until said rod has completed a full stroke in either direction, said means comprising an axially vmovable sleeve surrounding said rod and having transverse openings through the Walls thereof, ball members positioned in said openings, a pair of abutting collars around said sleeve, each having an inner surface tapered toward and adjacent the other, said surfaces converging away from said sleeve, said ball members always being in engagement with one of said tapered surfaces and said rod in order to Wedge against said rod to prevent reversemovement, and means for shifting said sleeve to move said balls into engagement with said rod and the other of said tapered surfaces after a full stroke of said ro 5.v In a liquid dispensing pump, a plunger, anl operating rod for reciprocatin said plunger, and means directly engageab e with said rod to prevent reverse movement of said rod until said rod has completed a full stroke in either direction, said means comprising an axially movable sleeve surrounding said rod and having transverse openings through the rod to prevent reverse movement, means for shifting said sleeve to move said balls into engagement with said rod and the other of said tapered surfaces after a full stroke of said rod, and resilient detent means engageable with said sleeve to prevent inadvertent shifting of said sleeve.

6. In a liquid dispensing pump, a reciprocable plunger, an operating rod therefor, a handle secured to said rod for imparting a down stroke to said rod and plunger, spring means for imparting an up stroke to said rod and plunger, and means directly engageable with said rod permitting a full down stroke i" iiltmwmmmm ava..

only and a full up stroke only of said rod and plunger, said means comprising an axially movable sleeve surrounding said rod, a cylindrical housing around said shell having tapered surfaces converging away from said sleeve, ball members carried by said sleeve and being movable transversely therewith in engagement with said rod and one o-f said tapered surfaces, spaced means on said rod at opposite sides of said sleeve arranged at the end of a full stroke thereof to shift said sleeve and move said ball members into engagement with said rod and the other of said tapered surfaces, and resilient dentent means movable through said shell to engage said sleeve and prevent inadvertent movement thereof.

7. In a liquid dispensing pump having a plunger rod, means permitting only a predetermined charge to be dispensed, comprising a sleeve surrounding said rod having transverse openings therein, ball members loosely mounted therein and in engagement with said rod, a housing for said sleeve having a pair of tapered inner circumferential surfaces converging away from said sleeve, one of said surfaces being in engagement with said balls to wedge the same against said rod during reverse movement of said rod until after a full stroke of said rod in the opposite direction, and means for shifting said sleeve to move said balls into engagement with the other of said surfaces, whereby to wedge said balls against said rod during the opposite reverse movement until after a full stroke thereof opposite to the lirst mentioned full stroke.

8. In a liquid dispensing pump, a reciprocable plunger, an operating rod for said plunger, handle means for imparting a stroke to said rod in one direction, spring means for imparting a stroke to said rod in the opposite direction, and means directly engageable with said rod permitting a full stroke only of said rod in either direction, said means comprising ball members engageable with said rod, stationary means engageable with said ball members, and a movable means to cause a wedging action of said ball members whereby to permit a full stroke only of said rod.

9. In a liquid dispensing pump, a reciprocable plunger, an operating rod for said plunger, handle means for imparting a stroke to said rod in one direction, spring means for imparting a stroke to said rod in the opposite direction, a wedging member having a curved surface making rolling contact with said rod, a member having a wedging surface inclined to the axis of said rod for contacting with the wedging member to wedge said wedging member against said rod in one direction of movement of said rod, a second member having an oppositely inclined wedgwith said stationary means and said rod.

ing surface for contacting with the wedging member to wedge it against said rod in the other directionof movement of said rod, control means for throwing said wedging member out of engagement with one of said inclined wedging surface members and into en.-

gagement with the other inclined wedging surface member, `and means carried by said rod for operating said control means to limit the movement of said rod to a full stroke in either direction.

l0. In a liquid dispensing pump, a reciprocable plunger, an operating rod for said plunger, handle means for imparting a stroke to said rod in one direction, spring means for imparting a stroke to said rod in the opposite direction, a rolling member contacting with the surface of said rod, a rigid sleeve having internal wedging surfaces inclined oppositely relative to the axis of said rod, a

longitudinally shiftable sleeve for selectively moving said rolling member out of contact with one of said wedging surfaces and into contact with the other of said wedging surfaces, and means carried by said rod for moving said shiftable sleeve in the direction of movement of said rod for reversing the wedging action of said rolling member relative to said rod.

ll. In a liquid dispensing pump, a reciprocable plunger, an operating rod for said plunger, handle means for imparting a stroke to said rod in one direction, spring means for imparting a stroke to said rod in the opposite direction, a rigid sleeve having internal wedging surfaces inclined oppositely relative to the axis of said rod, a wedging member interposed between the rod and said rigid sleeve member, a longitudinally shiftable sleeve for selectively moving said wedging member out ofcontact with one of said wedging surfaces of the rigid sleeve and into contact with the other of said wedging surfaces of the rigid sleeve, and means carried by said rod for moving said shiftable sleeve in the direction of movement of said rod for reversing the wedging action of said wedging member relative to said rod.

l2. In a liquid dispensing pump, the combination of a reciprocable plunger, an operating rod for the plunger, handle means for imparting a stroke to said rod in one direction, spring means for imparting a stroke to said rod in the opposite direction, a rigid sleeve surrounding the operating rod and having internal wedging surfaces inclined in opposite directions relative to the axis of said rod, a pair of spaced spring pressed locking detents carried by said rigid sleeve and extending through the inner face of said sleeve, an apertured control sleeve carrying a pair of pockets for receiving said spring pressed detents, said pockets being spaced a greater distance than the distance between said detente, whereby said spring pressed detents lock said control ysleeve in one of two alternativevpositions,`wedging means disposed Within the apertureof the control sleeve and alternately engaged with one or the other of said wedgl mg surfaces of said rigid sleeve by movement of the control sleeve, and means carried by